Upright brush



FIG. 1 is a perspective view of an upright brush showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a back view thereof;

FIG. 4 is a right-hand view thereof, the left-hand view being a mirror image; and,

FIG. 5 is a top view thereof. 

The ornamental design for an upright brush, as shown and described. 